Clifton College Scientific Society. 



19 



The most interesting results at present obtained as regards 

 fossils are : — 



1. ModiolsB being traced all througli down to 104 feet below the bone 



bed. 



2. The abundance of Athyris Roysii in Nos. 33 and 40. 



3. The assemblage of fossils in No. 57. 



4. The Spirorbis Helicteres or Serpula scalaris (?) in No. 81. 



5. Spirifera, lingula, and other shells in No. 113. 



6. The Lepidodendron and other plants in beds 135 to 138, 



List of beds forming the lower part of the Lower Limestone 

 shales, from the bone bed to the Old Eed Sandstone. Measured 

 on the upper line of railway to Avonmouth. The figures in 

 brackets give the depth heloio the bone bed. 



Bone bed — Principal fossils, . . . . . 



Fenestella, two or three species, Ceriopora rhonibifera, 

 Spirifera bisulcata, Spirifera glabra, Discina nitida, Lin- 

 gula mytiloides, Conularia quadrisulcata, Cladodus coni- 

 cus, Chomatodus linearis, Ctenacanthus tenuistratus, 

 Heiodus levissimus, Psammodus porosiis, Coprolites, 



1. Green marl, ...... 



2. Reddish gray limestone, ..... 



3. Red limestone, aluminous at top. Bryozoa abundant in 



non-aluminous part. 1,600,000 perfect fossils, besides 

 debris, in 1 lb. avoirdupois weight. The fossils are com- 

 posed of siUcate of iron, and are easily obtained by dis- 

 solving the matrix in dilute hydrochloric acid. About 

 one-third are composed of Bryozoa. Greater portion of 

 remainder encrinital ossicula ; a few pelvic plates of 

 Poteriocrinus ; numerous casts of two species of Entom- 

 ostraca. Fossils — Poteriocrinus, Platycrinus, Cythere 

 ovalis (new species), Cytherella lunata (new species), 

 Ceriopora rhombifera (Gold/.), Pleurotomaria pygmsea 

 (new species), Euomphalus triangulatus, Natica plicistria 

 {Young). Productus, one specimen. Psammodus porosus, 

 one tooth, small fish spine. In the aluminous portion 

 at top are many small Bryozoa ; the encrinites have 

 almost disappeared, 

 Red limestone, 



laches. 

 4 to 6 

 Ft. In. 



10. 

 11. 



12. 

 13. 

 14. 

 15. 

 16. 



Shale parting. 



Red limestone — 2 beds, 



Shale parting — variable. 



Red limestone, 



Shale parting, 



Red liniestone. 



Shale, green and red, 



Red limestone. 



Shale, 



Greenish limestone — 2 or 3 



Red shale. 



Thin limestone — 3 beds, 



beds, 



[15 

 [19 



[22 9] 



[23 10] 



6 

 6 

 1 

 9 

 2 

 11 

 1 

 

 1 

 6 

 1 

 4 

 4 

 4 



Vs 



